CVE-2026-63768 Details
Description
cal.diy through 6.2.0 contains an open redirect vulnerability in the conferencing OAuth callback endpoint that allows attackers to redirect users to arbitrary URLs by crafting malicious state parameters. Attackers can exploit the unsigned state parameter and onErrorReturnTo field to silently redirect visitors from the trusted domain to attacker-controlled URLs for phishing attacks.
An open redirect vulnerability has been identified in Cal.com Cal.diy versions through 6.2.0. The issue resides in the conferencing OAuth callback endpoint, which lacks proper authentication and validation. Attackers can exploit this vulnerability by crafting malicious state parameters that include arbitrary URLs. When a user clicks on a link from the trusted Cal.com API domain, they are silently redirected to the attacker-controlled URL, potentially leading to phishing attacks.
Users can update to the latest version of Cal.com Cal.diy, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Jul 20, 2026CISA-ADP
Assessed Jul 20, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/calcom/cal.diy/issues/29679 | [email protected] | ExploitIssue TrackingTechnical DescriptionVendor |
| https://github.com/calcom/cal.diy/pull/29681 | [email protected] | Issue TrackingVendor |
| https://www.vulncheck.com/advisories/cal-diy-conferencing-oauth-callback-open-redirect-via-unsigned-state | [email protected] | Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-601 | URL Redirection to Untrusted Site ('Open Redirect') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| cal.diy | <= 6.2.0 (semver) |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 17, 2026 | CVE Modified | [email protected] |
| Jul 20, 2026 | CVE Modified | CISA-ADP |
| Jul 20, 2026 | New CVE Received | [email protected] |